libnvme(2)

💖 enum nvme_cc — the controller configuration 💖

okay bestie, welcome to the libnvme manual, page libnvme(2). sit down, grab a strawberry 🍓, because today we're talking about enum nvme_cc, aka the controller configuration. this thing is literally the field that says how your controller is set up. it's giving "settings panel but make it an enum". 💅

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✨ NAME ✨

enum nvme_cc — this field indicates the controller configuration.

no cap, that's the whole vibe. 🫶

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🌈 SYNOPSIS 🌈

enum nvme_cc {
    NVME_CC_EN_SHIFT ,
    NVME_CC_CSS_SHIFT ,
    NVME_CC_MPS_SHIFT ,
    NVME_CC_AMS_SHIFT ,
    NVME_CC_SHN_SHIFT ,
    NVME_CC_IOSQES_SHIFT ,
    NVME_CC_IOCQES_SHIFT ,
    NVME_CC_CRIME_SHIFT ,
    NVME_CC_EN_MASK ,
    NVME_CC_CSS_MASK ,
    NVME_CC_MPS_MASK ,
    NVME_CC_AMS_MASK ,
    NVME_CC_SHN_MASK ,
    NVME_CC_CRIME_MASK ,
    NVME_CC_IOSQES_MASK ,
    NVME_CC_IOCQES_MASK ,
    NVME_CC_CSS_NVM ,
    NVME_CC_CSS_CSI ,
    NVME_CC_CSS_ADMIN ,
    NVME_CC_AMS_RR ,
    NVME_CC_AMS_WRRU ,
    NVME_CC_AMS_VS ,
    NVME_CC_SHN_NONE ,
    NVME_CC_SHN_NORMAL ,
    NVME_CC_SHN_ABRUPT ,
    NVME_CC_CRWME ,
    NVME_CC_CRIME

};

look at her. 27 members, all iconic, all in their little lineup like a girl group. 👑

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🎀 Constants 🎀

bestie listen: these are the actual spellings, we do NOT freestyle the names. every single one, in order, exactly as the compiler expects. 🧚

the shift amounts (bits be shifting ✨)

• NVME_CC_EN_SHIFT — shift amount to get the enable
• NVME_CC_CSS_SHIFT — shift amount to get the I/O command set selected
• NVME_CC_MPS_SHIFT — shift amount to get the memory page size
• NVME_CC_AMS_SHIFT — shift amount to get the arbitration mechanism selected
• NVME_CC_SHN_SHIFT — shift amount to get the shutdown notification
• NVME_CC_IOSQES_SHIFT — shift amount to get the I/O submission queue entry size
• NVME_CC_IOCQES_SHIFT — shift amount to get the I/O completion queue entry size
• NVME_CC_CRIME_SHIFT — shift amount to get the controller ready independent of media enable

the masks (cover-up but make it bitwise 💅)

• NVME_CC_EN_MASK — mask to get the enable
• NVME_CC_CSS_MASK — mask to get the I/O command set selected
• NVME_CC_MPS_MASK — mask to get the memory page size
• NVME_CC_AMS_MASK — mask to get the arbitration mechanism selected
• NVME_CC_SHN_MASK — mask to get the shutdown notification
• NVME_CC_CRIME_MASK — mask to get the I/O submission queue entry size
• NVME_CC_IOSQES_MASK — mask to get the I/O completion queue entry size
• NVME_CC_IOCQES_MASK — mask to get the controller ready independent of media enable

the command set options (pick ur fighter ⚔️)

• NVME_CC_CSS_NVM — NVM command set
• NVME_CC_CSS_CSI — all supported I/O command sets
• NVME_CC_CSS_ADMIN — admin command set only

the arbitration mechanisms (who goes first, no pushing 🚦)

• NVME_CC_AMS_RR — round robin
• NVME_CC_AMS_WRRU — weighted round robin with urgent priority class
• NVME_CC_AMS_VS — vendor specific

the shutdown notifications (say bye properly 😭)

• NVME_CC_SHN_NONE — no notification; no effect
• NVME_CC_SHN_NORMAL — normal shutdown notification
• NVME_CC_SHN_ABRUPT — abrupt shutdown notification

the "controller ready" girls (main character energy 👑)

• NVME_CC_CRWME — controller ready with media enable
• NVME_CC_CRIME — controller ready independent of media enable

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fr fr, that's the whole enum. no hidden lore, no extra members, we showed you everything. 🔥

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and that's a wrap on this one, bestie 🫶 this page came straight out of the libnvme API manual — yep, enum nvme_cc in libnvme(2) — and the date on it is July 2026. go forth and configure ur controller, you absolute icon. slay, periodt. 💖✨🎀🦋🌸